What they did
The poster, u/ExactRegion4839, plays games with a Twitch stream running in the background and wanted to hear the streamer without the stream's soundtrack and effects clashing with their own game audio. They had Claude Opus write an app for it in Rust. It captures the stream's audio, runs it through a speech enhancement engine (DPDFNet is one option) and plays back only the voice, with sliders for speech clarity, background suppression and voice preservation. It ships as a command line tool, a portable build and an installer for Windows, plus a Linux AppImage, with the source on GitHub.
How it went
The poster says it worked very well straight away. The command line version uses about 1 to 2% CPU and 15 to 30 MB of RAM on a Ryzen 5 7500F. Their preferred setup hides the original stream audio, uses DPDFNet with a 60 ms buffer and sets suppression to 100%, though the default maximum suppression preset is also good. The Linux build had not been tested by the poster.
Worth knowing
The harness was not named, though it was posted in r/ClaudeCode; the post says little about how the build went. Commenters wanted file input for cleaning up generated videos and a Linux stand-in for NVIDIA Broadcast; the poster said file import was coming.